There are a range of rare 50p coins in circulation that could land you with a small fortune.

One of the rarest - the Kew Gardens design is worth up to £300 on auction sites, but it isn't the only one collectors are willing to fork out for.

The original Peter Rabbit coins were released in 2016, and, if you can get you're hands on one, you could be looking at a lump sum worth thousands.

According to the coin experts at ChangeChecker , the lower the mintage number, the more valuable the coin can be - and right now there are five 50p editions in circulation that are classed as 'scarce' and 55 more that are classed as potentially valuable.

It checks the scarcity index that tracks all 59 circulating 50p coins based on their worth, reports Mirror Online.

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How often do coins in circulation become 'valuable'?

It's the question we're all asking so we decided to ask expert Philip Mussell, the director of Coin News , for some advice on what coins belong in the piggy bank and what belongs on eBay.

"There are a few different ways this happens", explained Philip Mussell, director of Coin News.

"One is when a mistake is made by the Royal Mint, like a 20p without a date, for example, or a 1983 2p coin accidentally printed with the old wording 'New Pence'. Mistakes are eminently collectable.

"Other collectibles are redesigns or limited edition releases. For example, an Olympic 50p with a swimmer was recently re-released.

"The first minting had a swimmer with waves obscuring her face but the designer didn’t want that, so they unobscured her face and made it clear of wavy lines. That’s now quite collectable," Mussell added.

1. Kew Garden 50p

The Kew Gardens 50p tops CoinChecker's scarcity index list.

It's stamped with the Kew Gardens Pagoda and with just 210,000 minted compared to a standard minting of around five million, it's classed as very rare.

That means they can sell for anything above £30 if you can find a collector.

How much it's worth: On eBay, we've tracked down coins selling for as much as £300.

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2. Football Olympic 50p

"The Olympic Sports 50p series was a revelation in coin collecting – for many it represents the start of their interest in UK circulation coins and thousands rose to the challenge of finding them all from their change," explained ChangeChecker.

There are 29 Olympic coins, but the football edition is classed as the rarest (although still over 1 million were struck).

Designed by journalist Neil Wolfson, the coin was created to encapsulate football in a simple image. As the offside rule is a perennial talking point, the image is designed to provoke discussion, which was what Wolfson was aiming for.

How much it's worth: We've seen these coins sell for around £27 online.

3. Triathlon Olympic 50p

In 2012, the Royal Mint released 29 commemorative 50p coins representing the sports of the Olympic and Paralympic Games. The Football 50p is not the only valuable one in this set - in fact there are five that collectors are after.

The Triathlon coin by Sarah Harvey shows a runner, cyclist and swimmer. Royal Mint figures show there are 2,179,000 in circulation.

How much it's worth: The top price we've seen these sell for £50.

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4. Wrestling Olympic 50p

Roderick Enriquez, a graphic designer from London, chose to design the wrestling 50p coin because it's such a well respected, historical sport, and of course, played a significant part in the Olympic and Paralympic Games. There are an estimated 1,129,500 in circulation at present.

How much it's worth: This coin has previously sold online for around £16.

5. Judo Olympic 50p

Another most sought after coin is the Judo 50p which also launched to celebrate the London Olympics. There are 1,161,500 in circulation right now.

How much it's worth: On eBay, this coin has been sold for £35.

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6. Tennis 50p

Released in the year before Andy Murray beat Roger Federer to a Gold medal in the 2012 Olympics, this coin depicts one of the nation's best-loved sports - and is part of the stunning Olympics collection.

How much it's worth: On eBay, this coin has been exchanged around the £20 mark.

7. Handball 50p

Handball is played in an indoor court between two teams of seven, the objective being to throw the ball into the opponent's goal using only your hands.

This coin was designed by Natasha Ratcliffe - the artist and sculptor behind the wheelchair rugby coin.

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8. Goalball 50p

Played competitively in more than 100 countries, Goalball is one of the most popular Paralympic sports.

Jonathan Wren, a freelance animator from Buckinghamshire was the designer of this 50p.

How much it's worth: On eBay, this coin has been exchanging hands for £45.

9. Rowing 50p

Rowing is one of Britain's most successful Olympic sports, and the only one where team GB have won a medal at every Games since 1984.

The Rowing 50p was designed by David Podmore, a graphic designer from East Yorkshire. He has a strong interest in typography and a great admiration for the sport - both of which are reflected in his design.